Die rolling



Nov. 16 {1926. 1,607,445

P. L. COYLE DIE ROLLING Filed July 25 1925 Patented Nov. 16, 1926.

UNITED STATES means PATENT prince.

PAUL L. OOYLE, OF COBAOIOLIS, PENNSYLVANIA. ASSIGNOR TO WITHEROW STEELCOMPANY, OF PITTSBURGH, PENNSYLVANIA. A CORPORATION OF PENNSYLVANIA.

DIE ROLLING.

Application filed July 23, 1925. Serial No. 45,509.

The present invention relates to die rolling, and is directed toward thelengthening of the life of the rollfrom which die rolled articles areproduced.

In the co-pending application of lVm. P. VVitherow, No. 527,202, filedJan 5, 1922, there is disclosed a method of die rolling by whichlongitudinal flash portions are rolled I on the side of the article,these flash por- H) tions' accommodating the excess metal and beingformed by such metal running out between the matrix portions of the tworolls.

I have found that if a sharp corner between the matrix portion of theroll and i the peripheral roll surface is left on the roll, the matrixdeteriorates very much faster than it does if the corner is blunted orbroken down to produce a fillet at the. junction of the article properand the flash portion which is integral therewith. I therefore providefor blunting or breaking down this corner so that the flash portion iscon nected to the article by a small fillet. This fillet has no effecton the final product as the flash is sheared from the article at thefillet. The life of the roll is materially lengthened by such provisionand the accuracy of the rolled product may be maintained over a fargreater period. This last 30 is true because the sharp corners formerlyfound on die rolls would roughen up and seemed to grip the hot metal insuch manner as to prevent the matrix from filling out as it should do toproduce an article of desired dimensions and smooth surface.

In the accompanying drawings, which illustrate more or lessdiagrammatically one embodiment of my invention,

Figure 1 is a section of a matrix portion of a die roll constructed inaccordance with my invention;

Figure 2 is a section through a die rolled article produced in thematrix of Figure 1;

Figure 3 is a view of a die rolled axle blank produced in accordancewith my invention showing the filleted flash attached to the axle blank;and

Figure 4 is a similar view showing the trimmed blank.

In the illustrated embodiment of my invention, there is shown a rollbody 2 having a matrix portion 3 cut therein. The dotted line indicatesthe section which it is desired to produce, and it will be noted thatthe sharp corner of the rolled. metal which would obtain if theperipheral surface P of the roll were continued to meet the outline ofthe matrix portion 3, has been blunted or broken down by removing asmall quantity of metal at the corner, as indicated at 4. The quantityof metal removed from the corner need not be great, but it should besufficient to give a reasonably blunt corner at the junction of thematrix surface and the peripheral roll surface so as to produce adefinite fillet on the article.

Figure 2 shows a section of an article produced in the matrix of theroll shown in Figure 1 and its mating roll, It will be seen that thissection consists of a body portion 5 having integral flash portions 6 onopposite sides thereof. These flash portions *8 are connected to thebody portion 5 by fillets 7 which result from the breaking down of thecorners on the matrix as above described.

Figure 3 is a plan view of a complete axle blank with the flash portionsthereon. Itwill be seen that the fillets 7 extend substantially theentire length of the flash pore tions. This is highly desirable not onlyin that it materially lengthens. the life of the roll, but also becauseexperience shows that with the corners of the matrix portion thusblunted or broken down there is less roughening of the side wall in theroll matrices and better results are obtained in rolling on thisaccount.

The provision of a blunted corner on the roll matrix brings about adecided improvement in the product. For example, in the rolling of rearaxles somewhat like that shown in Figure 3, it was found where rollshaving a sharp matrix corner were used that a decided gutter or undercutappeared in the portion 5 of the article adjacent the junction of theaxle proper and-the flash 6. This undercut was so deep that even thoughthe flash was very closely trimmed it still appeared in the article. Bythe provision of the blunted corners as herein disclosed the difficultywas entirely overcome and articles up to desired dimensions weresecured.

These fillets, which me be either angular,

radial or of any desire configuration, do not affect the final productas they are re- 'moved during the operation of shearing the flashportions from the article proper. On Figure 2 I have indicated by dottedline marked S the places where the flash portions are sheared from thebody, and it will be seen that the fillets are entirely removed so thatthe finalaxle blank is smooth and circular, as shown in Figure 4.

By the practice of my invention the life of the die rolls may bematerially increased and a higher quality of product may be secured. Thefilleting is particularly important in those portions of the articlewhere a heavy reduction from the leader is effected, as naturally theseportions of the roll are subject to the greatest wear.

\Vhile I have illustrated one form of my invention, it will beunderstood that it is not so limited as it may be otherwise embodied orpracticed withinthe scope of the following claims I claim:

1. The method of die rolling which includes forming a die rolled blankhaving integral flash portions, said flash portions forming no part ofthe finished article, there being a fillet at the junction of thearticle and the flash, and separating the flash from the article at thefillet.

2(The method of die rolling which includes forming a die rolled blankhaving integral flash portions, said portions forming no part of thefinished article, the flash being joined to the article by a fillet, andseparating both the flash and the fillet from the article. 7

3. The method of die rolling which includes forming a die rolled blankhaving integral flash portions, said portions forming no part of thefinished article, the flash being joined to the article by a fillet inthose portions of the article where a heavy reduction is effected in thedie rolling step, and removing the flash from the article at the fillet.

4. As a new article of manufacture, a pair of die rolls having matrixportions terminating in the roll peripheries, such matrix portions beingadapted to form a die rolled article when a leader is passed betweenthem, the peripheral portions of the rolls adjacent said matrices beingadapted to form a flash which is ultimately to be severed from thearticle formed in the matrices, the corner formed at the junction of amatrix portion and the ad'acent peripheral surface of the roll beinglunted.

portions being adapted to form a die rolled article when a leader ispassed between them,

the peripheral portions of the rolls adjacent said matrices beingadapted to form a flash which is ultimately to be severed from thearticle formed in the matrices, the corner formed at the junction of amatrix portion and the roll material at the corner of a matrix portionand the adjacent peripheral surface being broken down so as to produce afillet on the article joining the article proper and the flash.

6. As a new article of manufacture, a die rolled blank having anintegral flash adapted to be severed from the finished article, theflash being connected to the article proper by a fillet.

7. As a new article of manufacture, a die rolled blank having a bodyportion and diametrically opposite flash portions adapted for ultimateremoval from the body portion, said flash portions being strip-like andbeing connected to the article by fillets.

8. As a new article of manufacture, a die [rolled blank having a bodyportion and diametrically opposite flash portions adapted for ultimateremoval from the body portion, said flash ortions being strip-like andbeing connecte to the article by fillets, the fillets extendingsubstantially the entire length of the flash portions.

9. As a new article of manufacture, a die rolled blank having a bodyportion and diametrically opposite flash portions adapted for ultimateremoval from the body portion, said flash portions being strip-like andbeing connected to the article by fillets, the fillets extending alongthe flash over at least those portions of the article where a heavyreduction in the die rolling step has been effected.

10. As a new article of manufacture, a die rolled blank having a body.portion and an integral flash portion adapted for ultimate removal fromthe body portion, the line of separation between the flash portion andthe body portion being substantially well defined but neverthelessprovided with a fillet. In testimony whereof I have hereunto set myhand.

, PAUL L. COYLE.

